Social withdrawal and academic achievement, intertwined over years? Bidirectional effects from primary to upper secondary school

Abstract Background Socially withdrawn children tend to perform poorer academically than their peers. What remains unknown, is the temporal ordering of the two phenomena. Also, substantial gender differences exist in both social withdrawal and academic achievement; thus, it is conceivable that the strength of the relation between them is gendered as well. Aims To investigate cross‐sectional correlates and test directional effects of social withdrawal and academic achievement from primary to upper secondary school, and to examine potential gendered effects. Methods Prospective associations were analysed from age 6 to age 14 using biannual teacher ratings of children's social withdrawal and academic achievement in a representative community sample (n = 845), by means of random intercept cross‐lagged panel modelling. Results In boys, increased academic achievement at ages 8 and 12 forecasted decreased social withdrawal 2 years later, whereas increased social withdrawal at age 10 predicted reduced academic achievement at age 12. No such effects were seen in girls. Conclusions Social withdrawal and academic achievement are bidirectionally related among boys, but not girls. Results are discussed in light of need‐to‐belong theory, and practical implications for schools and teachers are illuminated.

, general self-esteem is distinguishable from specific self-esteem, so self-esteem may be differentiated in separate life areas, and tied to one specific social domain, such as school. This is in line with a review by Baumeister et al. (2003), suggesting that higher general self-esteem may be viewed as an outcome of academic performance rather than a cause, illustrating that self-esteem in one domain may be transmitted to the broader self. Thus, there is reason to believe that increased achievement in the school domain may be transmitted to global self-esteem, which manifests as more outgoing social behaviour, at least in the school/class environment. Such a crossover effect of self-esteem (see also Stenseng & Dalskau, 2010;Pierce et al., 2016) may spur cascades in which higher academic achievement results in less social withdrawal in the school setting, which might in turn foster more favourable academic development.
Girls and boys differ in their levels of academic maturity throughout childhood and adolescence (Pomerantz et al., 2002); thus, one may expect gender to moderate how the above-mentioned mechanisms unfold. However, the extent to which the outcomes of social withdrawal are gendered has been debated, and the results are mixed. In a review by Doey et al. (2014), it was suggested that social withdrawal constitutes a greater risk for boys than girls in terms of developmental problems. Building on this review, Rubin and Barstead (2014) conducted specific analyses of their data from The Friendship Project, finding that withdrawn 10-to 12-year-old boys were more likely than girls to be excluded and victimized by their peers.
Based on gender stereotypes, it could also be argued that shyness among boys makes them more vulnerable to negative teacher evaluations than among girls. Introversion normally diverges from masculinity traits (e.g. seeking power, showing strength; see Kling et al., 1999) so that reclusive behaviour may negatively affect how teachers perceive withdrawn boys' academic engagement. However, since it is more phenotypical for girls to perform well in school, an increase in boys' academic performance may be more socially facilitating for boys than for girls, for whom such academic performance might be less anticipated.
From the above-mentioned literature (i.e. Baumeister & Leary, 1995), it seems plausible to suggest that social withdrawal and academic achievement are intertwined throughout childhood and adolescence; however, prospective studies testing these potential cross-directional and reciprocal effects are lacking. Moreover, we expected that increased social withdrawal would predict decreased academic performance over time and that improved academic performance would predict decreased social withdrawal between time points. Based on previous studies, we hypothesized that these effects would be most pronounced in boys. Hence, we tested the bidirectional relationship between social withdrawal and academic achievement using a five-wave prospective sample. Multi-group analyses were conducted to analyse gender differences, and cross-sectional overlaps were also analysed. Because academic achievement and social functioning are rooted in common underlying causes, such as genetics, parental SES, cognitive abilities, temperament and parenting (Bartels et al., 2002;Kurdek & Sinclair, 2000), we applied random intercept cross-lagged panel modelling which accounts for all such unmeasured time-invariant confounders while illuminating paths at the within-person level.

Participants and procedure
The first wave of the Trondheim Early Secure Study (TESS; Steinsbekk & Wichstrøm, 2018) took place in 2007 and 2008 (T1) and included children born in 2003 or 2004 with parents living in Trondheim, Norway. This study used data from the second through sixth waves of data collection, when the children were 6, 8, 10, 12 and 14 years old, attending the first, third, fifth, seventh and ninth grades of elementary school respectively. A total of 1250 children were recruited to participate in the study, of which 997 were tested at the time of the study enrolment (M age = 4.55 years; 50.6% boys). At T1, 81% of the children were accompanied by their mothers, more than 99% of the children were of Western ethnic origin (e.g. Europe, United States), and 86% of these children had parents who lived together. Further reading of the procedure, recruitment and sample has been presented elsewhere (Steinsbekk & Wichstrøm, 2018). Figure 1 shows the participation rates and flow of the participants in more detail.
Teacher data were collected through questionnaires sent to schools and colleges. Teachers provided information on social withdrawal and academic achievement at all measurement points. Response rates among teachers were as follows: age 6 = 94.1%, age 8 = 92.2%, age 10 = 85.8%, age 12 = 82.3% and age 14 = 80.7%. This project was approved by the Regional Committee for Research Ethics, Mid-Norway (www.etikk om.no;REK 4.2008REK 4. .2632).

Social withdrawal
The Child Social Preference Scale (CSPS) (Coplan et al., 2004) was developed to assess social withdrawal (SW) among children. The CSPS instrument was originally a two-dimensional scale containing the dimensions of Shyness and Social Disinterest. In the TESS data, only the Conflicted Shyness dimension is available. Teachers rated each child on the dimension, consisting of seven items, with sample items such as 'The child declines social initiatives from other children because he/she is shy' and 'The child circles other children's play without participating'. Teachers in Norway normally engage in social activities outside the classroom, and co-learning is a widely used pedagogical tool that adds validity to these scores. Teachers rated each child for each item on a 5-point Likert scale, ranging from 0 (to a small degree) to 5 (to a large degree). The total of these responses was computed as the sum score for each child (see Table 1). Acceptable internal consistency coefficients were found for the construct, with Cronbach's alphas ranging from .87 to .76 over measure points.

Academic achievement
The Teacher Report Form (TRF) from the Achenbach System of Empirically Based Assessment (ASEBA) (Achenbach & Rescorla, 2000) was used to assess academic achievement (AA). Teachers reported the children's proficiency in three school subjects: reading, writing and mathematics. Teachers rated each of these academic proficiencies for each child on a 5-point scale, 1 ( far below grade), 2 (somewhat below grade), 3 (at grade level ), 4 (somewhat above grade) or 5 ( far above grade), with a maximum score of 15 and a minimum score of 3 (see Table 1). Teacher ratings of the children reflect the long-term development of their academic achievements in the classroom, as opposed to standardized tests that provide an assessment of the child's competence at a single point in time. The sum of the scores of these assessments (math, reading and writing) was computed for each time point. High internal consistency coefficients were found for the construct, with Cronbach's alpha values ranging from .76 to .89.

Data analysis
Cross-lagged effects of social withdrawal and academic performance from ages 6 to 14 were examined using structural equation modelling (SEM) in Mplus 8.1 (Muthén & Muthén, 2017). A random intercept cross-lagged panel model (RI-CPLM) was tested (Hamaker et al., 2015). This model refines the traditional autoregressive cross-lagged model of reciprocal relations between SW and AA by adding a stable between-person component (represented by two latent random intercepts loading on observed measures of AA and SW, respectively, across time) and a latent within-person component, which assesses changes in one's own mean level (e.g. AA t3 ) as a function of changes in one's own levels at a previous time point (e.g. AA t2 and SWt 2 , autoregressive and cross-lagged effects). Missing values were treated using the full information maximum-likelihood estimator (FIML). Multi-group analyses by sex were evaluated using the Satorra-Bentler Chi-square test (Satorra & Bentler, 2001). Model fit was determined according to the recommendations of Hu and Bentler (1998).

R E SU LTS
Weighted descriptive analyses, including mean-level differences between measurement times and bivariate correlations from Mplus 8.1, are presented in Table 1.

DISCUS SION
The primary aim of this study was to examine the prospective relationship between social withdrawal and academic achievement for schoolchildren across an 8-year period, from the first grade (age 6) to the ninth grade (age 14). Bidirectional effects of this interplay were proposed: (1) increased social withdrawal predicts decreased academic performance and (2) improved academic performance promotes lessened social withdrawal (over biannual measurements). First, and cross-sectionally, we found that social withdrawal and academic achievement were negatively related at all five measurement points. Of note, such a relationship has been found in several F I G U R E 2 Within-subjects cross-lagged effects of Social Withdrawal and Academic Achievement from random intercepts modelling for girls, ages 6, 8, 10, 12 and 14. Path coefficients are standardized regression weights (*p < .05, **p < .01 level) cross-sectional studies (e.g. Coplan et al., 2001;Crozier, 1995;Fantuzzo et al., 2003;Wentzel, 1991;Wentzel & Caldwell, 1997). Many mechanisms may explain this negative association. For example, because of the interactive and social nature of learning, socially withdrawn children might have more time to acquire the learning skills necessary for successful engagement in the classroom (Domínguez et al., 2010). Academic engagements, such as oral presentations, group projects and oral activity/classroom discussions, may prove challenging for children inhibited by social anxiety or fear of expressing themselves. When children avoid peer interaction, they are at risk of showing a lack of academic engagement and participation in school, which may dwindle their teachers' ratings of their academic performance (Hughes & Coplan, 2010). In addition, there are numerous potential spurious effects that cause both high social withdrawal and low academic achievement simultaneously, conceivably rooted in children's temperament and/or cognitive abilities.
Second, cross-lagged longitudinal analyses controlled for between-person variance and projected effects among boys but not among girls. For boys, higher academic achievement at age 8 attenuated social withdrawal from ages 8 to 10, and this was repeated from ages 12 to 14. In addition, greater social withdrawal at age 10 predicted lower academic achievement from 10 to 12 years of age. These results indicate that cascade-like relations may emerge for some boys; better academic achievement results in less social withdrawal, which then supports more optimal academic development, or antagonistically, lower academic performance instigates more social withdrawal, which then leads to lower academic performance. These gendered effects are relevant to the findings of Doye et al. (2014) and the follow-up analyses made by Rubin and Barstead (2014), supporting the notion that withdrawn boys are more vulnerable to negative social effects than girls. Potential explanations for these gender effects are indicated in the introduction; being outgoing may be more valuable for boys than girls, because it is associated with masculinity, and thus social withdrawal has more fundamental negative consequences on academic achievement for boys than girls, perhaps especially during puberty (Kling et al., 1999). This could explain how socially withdrawn boys were perceived by their teachers. For instance, socially withdrawn boys tend to perform poorly on oral examinations in school, thus risking lower grades (Crozier & Hostettler, 2003). This is underscored by Hughes and Coplan (2010), who found that child shyness correlated more negatively with teacher-rated academic performance than scores on standardized scholastic tests. The gender effect in our data could also originate from internal psychological processes among boys such as changes in self-esteem. Large community studies have consistently found that adolescent boys -in general -score higher than girls on self-esteem (Kling et al., 1999). As reported by von Soest et al. (2016), from a large Norwegian prospective community study looking at six domains of specific self-esteem, boys scored lower than girls in two domains: social acceptance and close relationships. F I G U R E 3 Within-subjects cross-lagged effects of Social Withdrawal and Academic Achievement from random intercepts modelling for boys, ages 6, 8, 10, 12 and 14. Path coefficients are standardized regression weights (*p < .05, **p < .01 level) Thus, the observed crossover effect of academic achievement on less social withdrawal observed only among boys may be due to the greater potential for upward change among boys when it comes to social self-esteem and social functioning. Marino et al. (2020) found that levels of self-esteem were modifiable through a mentoring programme (Mentor-UP) conducted in Italian schools among 11-to 13-year-olds, indicating that tailored interventions aimed at enhancing self-esteem in schools may constitute a path for building better academic performance. Potentially, such programmes may be most favourable for boys who are high in social withdrawal but low in self-esteem.
As mentioned, the fundamental need to achieve social acceptance and inclusion is at the core of the need-to-belong theory (Baumeister & Leary, 1995). Previous longitudinal studies found that social exclusion in the school context compromises the development of self-regulation (Stenseng et al., 2015(Stenseng et al., , 2016, which is further linked to adaptive learning strategies. An interpretation of the present results that increased academic achievement leads to less social withdrawal is that students who perform well in school are likely to be perceived as successful by their peers, which make them more attractive as learning partners, and enhances their social status among peers. This could further accelerate their interest in and motivation to interact with co-students and teachers (Wentzel & Caldwell, 1997). A cycle of positive events could occur: the cycle begins with an increase in academic achievement, which boosts students' self-esteem, social status and motivation for peer interactions. This increase in self-esteem and social interaction could reduce children's levels of shyness and improve their self-regulation and learning skills, which affect both social and academic functioning at school.

Limitations
This study adds to the literature on the academic achievement of socially withdrawn children, but some limitations in this study must be discussed. First, this study did not consider potential time-varying factors, such as family, classroom, peer and teacher characteristics that could influence the academic performance of socially withdrawn children. Second, although the internal consistency of the academic domains (math, reading and writing) was high across the respective school years, there is a risk that a differentiated pattern of relationships is masked when using computed sum scores. However, although domain-specific hypotheses were not investigated in this study, they may be warranted in future research. Third, this study only assessed the conflicted shyness dimension of the Child Social Preference Scale (Coplan et al., 2004), leaving out two other dimensions: social disinterest and active isolation. It is conceivable that these dimensions of social withdrawal may relate differently to academic performance than is projected in this study. Fourth, whereas teachers may have a rather solid footing for rating their students' level of social withdrawal in the early school years, which is a time when much of the learning in and outside the classroom is play based, this may diminish as the children enter the secondary school years, when teaching becomes more structured and less improvised the latter is also true socially. Finally, we are short of a meaningful interpretation of the positive effect of academic achievement at age 6 on social withdrawal at age 8, controlled for age 6 levels, found among boys. One suggestion is that academically mature boys steer away from play activities typical for boys at this age, which then is misinterpreted as social withdrawal; however, this clearly needs further exploration.

Implications and conclusions
As shown in this study, social withdrawal is entangled with academic achievement both crosssectionally and prospectively. Our findings show that academic performance promotes social functioning, and vice versa, but primarily among boys, which is in accordance with previous research showing that boys are more vulnerable to social withdrawal than girls (Doyle et al, 2014). Traditionally, at least in Western schools, the emphasis has been on creating a safe and nurturing social context for withdrawn children, which is supposed to instigate optimal learning. Specifically,